package com.bootdo.clouddo.utils;

public class MD5 {

	private static boolean hexcase = false; 
	private static int chrsz   = 8;
	

	public static String hex_md5(String s){ 
		return binl2hex(core_md5(str2binl(s), s.length() * chrsz));
	}

	public static int[] str2binl(String str)
	{
	  int[] bin = new int[(str.length()*chrsz>>5)+1];
	  int mask = (1 << chrsz) - 1;
	  for(int i = 0; i < str.length() * chrsz; i += chrsz){
		int charCodeAt = (int)str.charAt(i / chrsz);
	    bin[i>>5] |= (charCodeAt & mask) << (i%32);
	  }
	  return bin;
	}
	
	 public static String getRandom(int length) {
        String a = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
        char[] rands = new char[length]; 
        for (int i = 0; i < rands.length; i++) 
        { 
            int rand = (int) (Math.random() * a.length()); 
            rands[i] = a.charAt(rand); 
        }
        return String.valueOf(rands);
    }
	
	public static int[] core_md5(int[] x, int len)
	{
	  /* append padding */
	  x[len >> 5] |= 0x80 << ((len) % 32);
	  if(x.length < (((len + 64) >>> 9) << 4) + 14){
		  int[] newArr = new int[(((len + 64) >>> 9) << 4) + 14+1];
		  for (int i = 0; i < x.length; i++) {
			newArr[i] = x[i];
		  }
		  x = newArr;
	  }
	  x[(((len + 64) >>> 9) << 4) + 14] = len;

	  int a =  1732584193;
	  int b = -271733879;
	  int c = -1732584194;
	  int d =  271733878;

	  for(int i = 0; i < x.length; i += 16)
	  {
	    int olda = a;
	    int oldb = b;
	    int oldc = c;
	    int oldd = d;
	    
	    if(x.length < i + 16){
	    	int[] newArr = new int[i+16];
	    	for (int j = 0; j < x.length; j++) {
				newArr[j] = x[j];
			}
	    	x = newArr;
	    }

	    a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
	    d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
	    c = md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);
	    b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
	    a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
	    d = md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);
	    c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
	    b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
	    a = md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
	    d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
	    c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
	    b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
	    a = md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);
	    d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
	    c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
	    b = md5_ff(b, c, d, a, x[i+15], 22,  1236535329);

	    a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
	    d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
	    c = md5_gg(c, d, a, b, x[i+11], 14,  643717713);
	    b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
	    a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
	    d = md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);
	    c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
	    b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
	    a = md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
	    d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
	    c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
	    b = md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);
	    a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
	    d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
	    c = md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);
	    b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);

	    a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
	    d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
	    c = md5_hh(c, d, a, b, x[i+11], 16,  1839030562);
	    b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
	    a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
	    d = md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);
	    c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
	    b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
	    a = md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);
	    d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
	    c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
	    b = md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);
	    a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
	    d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
	    c = md5_hh(c, d, a, b, x[i+15], 16,  530742520);
	    b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);

	    a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
	    d = md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);
	    c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
	    b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
	    a = md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);
	    d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
	    c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
	    b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
	    a = md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
	    d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
	    c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
	    b = md5_ii(b, c, d, a, x[i+13], 21,  1309151649);
	    a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
	    d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
	    c = md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);
	    b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);

	    a = safe_add(a, olda);
	    b = safe_add(b, oldb);
	    c = safe_add(c, oldc);
	    d = safe_add(d, oldd);
	  }
	  int[] result = new int[]{a,b,c,d};
	  return result;

	}
	
	public static int md5_cmn(int q,int a,int b,int x,int s,int t)
	{
	  return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
	}
	public static int md5_ff(int a,int b,int c,int d,int x,int s,int t)
	{
	  return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
	}
	public static int md5_gg(int a,int b,int c,int d,int x,int s,int t)
	{
	  return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
	}
	public static int md5_hh(int a,int b,int c,int d,int x,int s,int t)
	{
	  return md5_cmn(b ^ c ^ d, a, b, x, s, t);
	}
	public static int md5_ii(int a,int b,int c,int d,int x,int s,int t)
	{
	  return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
	}


	public static int safe_add(int x, int y)
	{
	  int lsw = (x & 0xFFFF) + (y & 0xFFFF);
	  int msw = (x >> 16) + (y >> 16) + (lsw >> 16);
	  return (msw << 16) | (lsw & 0xFFFF);
	}
	
	public static int bit_rol(int num,int cnt)
	{
	  return (num << cnt) | (num >>> (32 - cnt));
	}
	
	public static String binl2hex(int[] binarray)
	{
	  String hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
	  String str = "";
	  for(int i = 0; i < binarray.length * 4; i++)
	  {
	    str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +""+
	           hex_tab.charAt((binarray[i>>2] >> ((i%4)*8  )) & 0xF);
	  }
	  return str;
	}
	
}
